Merge "Fixing issue with missing scroll bar after fast-scrolling and searching." into ub-launcher3-burnaby

src/com/android/launcher3/allapps/AllAppsRecyclerView.java

@@ -102,6 +102,10 @@ public class AllAppsRecyclerView extends BaseRecyclerView
      * Scrolls this recycler view to the top.
      */
     public void scrollToTop() {
+        // Ensure we reattach the scrollbar if it was previously detached while fast-scrolling
+        if (mScrollbar.isThumbDetached()) {
+            mScrollbar.reattachThumbToScroll();
+        }
         scrollToPosition(0);
     }